Sold individually.Specifically designed to improve the ergonomics of the SIG 556 series of rifles and pistols. The EMBR Extended Magazine Button Release extends the reach of the magazine button 1" so that the magazine can be released from the rifle without changing the shooter's grip.The EMBR Extended Magazine Button Release will not only work on the SIG 556 series of rifles and pistols but will also work on the AR-15 family of firearms, and on any weapon that uses the standard AR-15 magazine release button.It is particularly useful for those with smaller hands or short fingers or on any weapon with a large grip that positions the trigger hand farther back.The EMBR button is made of anodized aluminum, and the pad is made of a high strength polymer and molded in a selection of colors.The extension pad is installed with two 4-40 thread screws, and the button can be used sans extension pad as a normal magazine release button.The EMBR is manufactured in the USA, and this set includes the aluminum button, polymer extension pad, two 4-40 thread screws, a tube of blue loctite, and an instruction sheet for installation.